Wed, 26 Nov 2008 23:12:05 +0000
Fix to make a global configmanager instance
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1 | |
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2 | local md5 = require "md5" |
38 | 3 | local log = require "util.logger".init("sasl"); |
4 | local tostring = tostring; | |
5 | local st = require "util.stanza"; | |
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6 | local generate_uuid = require "util.uuid".generate; |
38 | 7 | local s_match = string.match; |
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8 | local gmatch = string.gmatch |
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9 | local string = string |
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10 | local math = require "math" |
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11 | local type = type |
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12 | local error = error |
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13 | local print = print |
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14 | |
38 | 15 | module "sasl" |
16 | ||
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17 | local function new_plain(realm, password_handler) |
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18 | local object = { mechanism = "PLAIN", realm = realm, password_handler = password_handler} |
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19 | function object.feed(self, message) |
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20 | |
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21 | if message == "" or message == nil then return "failure", "malformed-request" end |
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22 | local response = message |
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23 | local authorization = s_match(response, "([^&%z]+)") |
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24 | local authentication = s_match(response, "%z([^&%z]+)%z") |
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25 | local password = s_match(response, "%z[^&%z]+%z([^&%z]+)") |
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26 | |
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27 | if authentication == nil or password == nil then return "failure", "malformed-request" end |
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28 | |
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29 | local password_encoding, correct_password = self.password_handler(authentication, self.realm, "PLAIN") |
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30 | |
405 | 31 | if correct_password == nil then return "failure", "not-authorized" |
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32 | elseif correct_password == false then return "failure", "account-disabled" end |
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33 | |
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34 | local claimed_password = "" |
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35 | if password_encoding == nil then claimed_password = password |
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36 | else claimed_password = password_encoding(password) end |
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37 | |
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38 | self.username = authentication |
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39 | if claimed_password == correct_password then |
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40 | return "success" |
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41 | else |
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42 | return "failure", "not-authorized" |
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43 | end |
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44 | end |
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45 | return object |
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46 | end |
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47 | |
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48 | local function new_digest_md5(realm, password_handler) |
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49 | --TODO maybe support for authzid |
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50 | |
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51 | local function serialize(message) |
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52 | local data = "" |
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53 | |
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54 | if type(message) ~= "table" then error("serialize needs an argument of type table.") end |
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55 | |
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56 | -- testing all possible values |
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57 | if message["nonce"] then data = data..[[nonce="]]..message.nonce..[[",]] end |
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58 | if message["qop"] then data = data..[[qop="]]..message.qop..[[",]] end |
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59 | if message["charset"] then data = data..[[charset=]]..message.charset.."," end |
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60 | if message["algorithm"] then data = data..[[algorithm=]]..message.algorithm.."," end |
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61 | if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end |
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62 | if message["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," end |
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63 | data = data:gsub(",$", "") |
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64 | return data |
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65 | end |
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66 | |
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67 | local function parse(data) |
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68 | message = {} |
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69 | for k, v in gmatch(data, [[([%w%-]+)="?([%w%-%/%.%+=]+)"?,?]]) do |
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70 | message[k] = v |
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71 | end |
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72 | return message |
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73 | end |
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74 | |
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75 | local object = { mechanism = "DIGEST-MD5", realm = realm, password_handler = password_handler} |
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76 | |
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77 | --TODO: something better than math.random would be nice, maybe OpenSSL's random number generator |
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78 | object.nonce = generate_uuid() |
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79 | object.step = 0 |
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80 | object.nonce_count = {} |
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81 | |
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82 | function object.feed(self, message) |
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83 | self.step = self.step + 1 |
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84 | if (self.step == 1) then |
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85 | local challenge = serialize({ nonce = object.nonce, |
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86 | qop = "auth", |
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87 | charset = "utf-8", |
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88 | algorithm = "md5-sess", |
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89 | realm = self.realm}); |
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90 | return "challenge", challenge |
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91 | elseif (self.step == 2) then |
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92 | local response = parse(message) |
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93 | -- check for replay attack |
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94 | if response["nc"] then |
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95 | if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end |
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96 | end |
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97 | |
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98 | -- check for username, it's REQUIRED by RFC 2831 |
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99 | if not response["username"] then |
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100 | return "failure", "malformed-request" |
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101 | end |
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102 | self["username"] = response["username"] |
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103 | |
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104 | -- check for nonce, ... |
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105 | if not response["nonce"] then |
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106 | return "failure", "malformed-request" |
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107 | else |
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108 | -- check if it's the right nonce |
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109 | if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end |
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110 | end |
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111 | |
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112 | if not response["cnonce"] then return "failure", "malformed-request", "Missing entry for cnonce in SASL message." end |
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113 | if not response["qop"] then response["qop"] = "auth" end |
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114 | |
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115 | if response["realm"] == nil then response["realm"] = "" end |
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116 | |
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117 | local domain = "" |
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118 | local protocol = "" |
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119 | if response["digest-uri"] then |
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120 | protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$") |
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121 | if protocol == nil or domain == nil then return "failure", "malformed-request" end |
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122 | else |
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123 | return "failure", "malformed-request", "Missing entry for digest-uri in SASL message." |
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124 | end |
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125 | |
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126 | --TODO maybe realm support |
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127 | self.username = response["username"] |
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128 | local password_encoding, Y = self.password_handler(response["username"], response["realm"], "DIGEST-MD5") |
405 | 129 | if Y == nil then return "failure", "not-authorized" |
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130 | elseif Y == false then return "failure", "account-disabled" end |
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131 | |
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132 | local A1 = Y..":"..response["nonce"]..":"..response["cnonce"]--:authzid |
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133 | local A2 = "AUTHENTICATE:"..protocol.."/"..domain |
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134 | |
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135 | local HA1 = md5.sumhexa(A1) |
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136 | local HA2 = md5.sumhexa(A2) |
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137 | |
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138 | local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2 |
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139 | local response_value = md5.sumhexa(KD) |
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140 | |
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141 | if response_value == response["response"] then |
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142 | -- calculate rspauth |
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143 | A2 = ":"..protocol.."/"..domain |
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144 | |
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145 | HA1 = md5.sumhexa(A1) |
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146 | HA2 = md5.sumhexa(A2) |
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147 | |
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148 | KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2 |
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149 | local rspauth = md5.sumhexa(KD) |
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150 | self.authenticated = true |
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151 | return "challenge", serialize({rspauth = rspauth}) |
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152 | else |
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153 | return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated." |
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154 | end |
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155 | elseif self.step == 3 then |
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156 | if self.authenticated ~= nil then return "success" |
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157 | else return "failure", "malformed-request" end |
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158 | end |
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159 | end |
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160 | return object |
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161 | end |
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162 | |
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163 | function new(mechanism, realm, password_handler) |
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164 | local object |
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165 | if mechanism == "PLAIN" then object = new_plain(realm, password_handler) |
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166 | elseif mechanism == "DIGEST-MD5" then object = new_digest_md5(realm, password_handler) |
38 | 167 | else |
168 | log("debug", "Unsupported SASL mechanism: "..tostring(mechanism)); | |
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169 | return nil |
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170 | end |
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171 | return object |
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172 | end |
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173 | |
38 | 174 | return _M; |